2

Tobacco and kids:
I get concerned about parental influence when i hear about young kids getting ahold of cigarettes. The body is not built to withstand abuse from smoking at any age, but effects on growing children are even more worrisome. Long-time smokers can develop many leg problems, including vein thrombosis (clot), neuropathy or "poor circulation". It is best to see a physician asap for diagnosis, treatment.
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8

Not serious...:
If this is a "firm" ring/cord like area behind the head of the penis we usually diagnose as sclerosing lymphanigits which is a thrombosed lymphatic tissue. It is benign and often follows vigorous sexual activity. Antiinflammatory medications may be useful if there's discomfort but it usually resolves spontaneously within weeks to months.
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10

Picture:
This is a case where a picture would be worth 1000 words.. Can't tell from a brief description.. but how long has this been going on.. what do you mean 'changes form' ? Is it a spreading rash ? If so, try OTC clomitrazole.. If it continues, please let your Dr examine this..
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